How's about an arena where the ground vehicles aren't so lame? Remove the ostwind or give it 13mm guns. See how many people drive them around then. Or set the flak's guns to a specific range and have them detonate. As it is, it's damn near impossible to bomb one if they see you. Sure.. blowing them up is nice but not when you're down to 1 wing, on fire, with your left hand down your pants scratching yourself and you've been jinxing the whole way. "lobbing" bombs at those things don't work either. Turn away, oops your belly is exposed.. BOOM you just got a 37mm enema. How does that feel? Not to mention now they spawn at all one central location. Disperse them within a mile of each other. As it is they aren't very far away from fields, then they are all in clusters, and after about 2-3 mins they're creeping within firing range of the runway. Don't take down the hangars or try to take the field.. No way that's TOO damn hard. Just kill 'em while they take off. I'm not talking about panzers, M3s or M16s here.. it's the freakin ostwind. Add recoil, no way firing a 37mm wouldn't have a lot of dispersion at long range. Especially if it's sitting stationary on the ground.
Or let the field spawn some form of automated defense. Vehicles could never get that close to an airbase in any war unless all the front line troops and second line, etc are dead.
-SW